SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1592f07544bd2cb217e1006cb9aa01b029034b39361cefd63107c17568e875ba' 
  AND token = '/vgwkB6msxyBtuTagv6/8ZbiqqXd337rjKrH7tB6y48=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

Explain
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE Impossible WHERE noticed after reading const tables